8077681 has 4 divisors (see below), whose sum is σ = 8210164. Its totient is φ = 7945200.

The previous prime is 8077673. The next prime is 8077687. The reversal of 8077681 is 1867708.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 349281 + 7728400 = 591^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 8077681 - 2³ = 8077673 is a prime.

It is a super-2 number, since 2×8077681² = 130497860675522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8077681.

It is not an unprimeable number, because it can be changed into a prime (8077687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66150 + ... + 66271.

It is an arithmetic number, because the mean of its divisors is an integer number (2052541).

Almost surely, 2^8077681 is an apocalyptic number.

It is an amenable number.

8077681 is a deficient number, since it is larger than the sum of its proper divisors (132483).

8077681 is a wasteful number, since it uses less digits than its factorization.

8077681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132482.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 8077681 is about 2842.1261407615. The cubic root of 8077681 is about 200.6452576407.

The spelling of 8077681 in words is "eight million, seventy-seven thousand, six hundred eighty-one".